staging: axis-fifo: Remove noisy error messages for user errors

staging: axis-fifo: Remove noisy error messages for user errors

Remove dev_err() calls for conditions caused by invalid userspace
input. Logging them clutters the kernel log, especially if userspace
repeatedly makes invalid calls.

Also, consolidate the write validation checks into a single condition.

Signed-off-by: Ovidiu Panait <ovidiu.panait.oss@gmail.com>
Link: https://patch.msgid.link/20251227212640.3321310-7-ovidiu.panait.oss@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>